Color photography.



i ture is well adapted for this purpose.-

ceptacle filled with a liquid adapted to furparticles in their solid state.

UNITED STATES PATENT onnron.

ISIDOR KITSEE, QE PHILADEI'EHIA, PENNSYLVANIA.

oonoa PHOTOGRAPHY.

Specification of Letters-Patent.

Patented Nov. 23, 1916 Application filed April 8, 1915. Serial No. 19,969.

To all whom it may concern.

Be it known that I, Ismon Krrsnn, a citi-.

reference to themethod of and means for producingcolor-carriers and the application of same ,to photographic blanks.

The color-carriers of auto-chromes of today have the following disadvantages First :-The particles undergo a chemical change when exposed to intense light, and as a consequence the color changes, that is, fades. transparent. Third :The sub-division is not minute enough.

The object of my invention is to overcome these difficulties, and for the purpose of assisting persons versed in the art to practice this m invention, I will enumerate some examp es:

Example 1': Soluble cellulose, dissolved in one of its solvents, for instance acetone or amyl acetate, the solution is colored to suit requirements and is then sprayed froma comparatively great height through an atmosphere adapted to make the individual particles non-adherent and adapted to evaporatethe solvent, thereby leaving the minute 7 An atmosphere of steam, not of too high a temgerather coagulate each particle is provided at the lower end of the tower or tube. Water will answer the purpose.

Example 2": Gelatin is dissolved and dyed to suit requirements. This solution is then sprayed from a comparatively great height through an atmosphere which coagulates each particle, and makes-the same nonadherent to the next particle. A tower or tube should be employed as in Example 1, and to make the atmosphere suitable for the purpose in question, I prefer to charge the air contained in said tower or tube, with fumes of formaldehyde.

It is obvious that particles of as many colors as desired, may be produced, either in accordance with Example 1 or Example 2, and it is only necessary to state that the Second :The carrier itself is not" colors to be used with celluloid, should not be soluble in water, (anilin colors are therefore preferred). Generally a three color scheme is employed in color-photography,

such for instance asred, yellow, blue, but

for the purpose of my invention, it is immaterial 1f athree or four color scheme is preferred, and the colors may vary without departing from the scope of my invention. After the particles carrying the different colors have been dried,'they are, by preference with the aid of a revolving drum, carefully inter-mixed.

To. apply the so preferred color-carriers to the surface of a blank to be used later in color-photography, I prefer the following steps :The surface of the blank is first made adhesive. If celluloidis used, a gum. arabic or gelatin solution will answer the purpose well; Ifgelatin is used, a celluloid solution may answer, but under no circumstances should the adhesive coat consist of a material in which the carrier or its color is soluble.

. The careful and-exact preparation of the blanks for the reception of the color particles is of greatimportance, and on it depends to a great extent the full sucoess'of the ;operation. The moistening of the surface'of the blank with the adhesive solution, and the adhesiveness of the solution itself has to be just sufficient so that the color particles may cover the whole surface, but

should not be able to retain a second particle on top of the first particle; in other words, the unit of color should not be increased by a second particle of the same color or de-- creased through a particle'of different color. When the surface of the blank is in just the condition required, then the color-carriers, inter-mixed as to the different colors, are placed in a sprayer and sprayed onto the prepared surface. After a few minutes, the

surplus particles are, by preference with the aid of an air-sprayer, removed from the surface and the blank has to undergo a careful inspection, 'to ascertain if two or more particles are covering each other. In such case, it is best to remove either the upper particle alone or all the particles from the particular spot, and cover the same again.

A short practice will soon advise the op erator as to what density his adhesive solution should have, and the time necessary to elapse between the covering of the blank with the solution, and application of the by formaldehyde in a suitable liquid, color-- color particles to the surface, so that the proper degree of moisture and adhesiveness is reached.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. The method of producing color carriers for -autochrome blanks, which consists in first dissolving a suitable solid in a liquid, dyeing that liquid with a suitable color, spraying the colored liquid through a gaseous atmosphere adapted to produce a nonadherence between the different particles, drying the different particles, producing such particles of as many colors as required, and interunixing the particles of different colors.

2. The method of producing auto-chrome olanks which consists in first producing the different color carriers through the process of spraying the color solutions, each separately, through an atmosphere surcharged with a chemical agent adapted to make the different particles non-adherent, then intermixing the different colored particles and cementing the same onto the blank adapted to be used for an auto-chrome.

3. In the production of color carriers for autochrome blanks the step which consists in first dissolving a suitable solid coagulable ing the same with a suitable color and then spraying the same through an atmosphere surcharged with formaldehyde.

4. In the art of producing color screens for photographic blanks the method which consists in first dissolving suitable solid substances coagulable by formaldehyde in suitable liquids, dyeing said dissolved substances in the required colors, spraying the 50-001- ored liquids, each separately through an atmos here containin formaldehyde therebv p b 7 u carriers and cementing the same on a suit-v able base adapted for photographic purposes.

In testimony whereof I aifix my signature in presence of two Witnesses.

ISIDOR KITSEE. Witnesses:

MARY FITZGERALD, FRANCES RUTHERFORD. 

